public class Test {
    public static void main(String args[]){
        int x = 30;

        if( x == 10 ){
            System.out.print("Value of X is 10");
        }else if( x == 20 ){
            System.out.print("Value of X is 20");
        }else if( x == 30 ){
            System.out.print("Value of X is 30");
        }else{
            System.out.print("这是 else 语句");
        }

        int y = 10;

        if( x == 30 ){
            if( y == 10 ){
                System.out.print("X = 30 and Y = 10");
            }
        }
    }
}
